PromiseRender.js 1.42 KB
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import React from 'react';
import { Spin } from 'antd';

export default class PromiseRender extends React.PureComponent {
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  state = {
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    component: null,
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  };
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  componentDidMount() {
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    this.setRenderComponent(this.props);
  }
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  componentWillReceiveProps(nextProps) {
    // new Props enter
    this.setRenderComponent(nextProps);
  }
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  // set render Component : ok or error
  setRenderComponent(props) {
    const ok = this.checkIsInstantiation(props.ok);
    const error = this.checkIsInstantiation(props.error);
    props.promise
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      .then(() => {
        this.setState({
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          component: ok,
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        });
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      })
      .catch(() => {
        this.setState({
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          component: error,
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        });
      });
  }
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  // Determine whether the incoming component has been instantiated
  // AuthorizedRoute is already instantiated
  // Authorized  render is already instantiated, children is no instantiated
  // Secured is not instantiated
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  checkIsInstantiation = target => {
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    if (!React.isValidElement(target)) {
      return target;
    }
    return () => target;
  };
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  render() {
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    const Component = this.state.component;
    return Component ? (
      <Component {...this.props} />
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    ) : (
      <div
        style={{
          width: '100%',
          height: '100%',
          margin: 'auto',
          paddingTop: 50,
          textAlign: 'center',
        }}
      >
        <Spin size="large" />
      </div>
    );
  }
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}